JP6852993B2 - Concrete structure and how to form the concrete structure - Google Patents

Description

The present invention relates to a concrete structure having a partition material for joining or separating concrete when placing concrete, and a method for forming the concrete structure.

As a concrete splicing method for placing concrete on another day, lath net welding, air fence installation, sponge control installation, etc. are adopted as general construction methods.
Then, in Patent Document 1, the applicant has proposed a concrete partition plate in which an expanded metal (lath net) is installed in a concrete frame of PCa for concrete casting to separate concrete having different strengths of columns and beams.

Japanese Patent No. 4398696 (Japanese Unexamined Patent Publication No. 2005-120626)

However, even with the conventional lath net welding, air fence installation, sponge control installation, and the concrete partition plate of Patent Document 1, concrete spillage occurs on the concrete joint surface and the concrete casting surface, and concrete is placed in the adjacent part. Prior to installation, it is necessary to provide a cleaning port on a part of the formwork and remove the leaked concrete from between the reinforcing bars that have already been arranged for cleaning.

An object of the present invention is to provide a concrete structure that prevents the occurrence of slag leakage on the concrete joint surface and the concrete joint surface and eliminates the need for post-cleaning treatment.

In order to solve the above problems, the invention according to claim 1 is
A concrete structure composed of a first concrete material to be cast first, a second concrete material to be cast later, and a partition material to be installed on a joint surface or a partition surface between the first and second concrete materials. hand,
The partition member is made of a cement-based adhesive that is formed with the netting, the mesh on the front and back surfaces of the network member to fort Guyo having a mesh disposed along the strike joint face or hitting divided surface adhesion It is characterized by comprising an agent layer.

The invention according to claim 2
The concrete structure according to claim 1.
It is characterized by including a concrete frame formed around the net body.

The invention according to claim 3
The concrete structure according to claim 1 or 2.
The net body is characterized in that a reinforcing bar through hole is formed.

The invention according to claim 4
An adhesive layer made of a cement-based adhesive is formed on the front and back surfaces of the mesh body so as to close the mesh on a partition material having a mesh body arranged along the joint surface or the partitioning surface.
On one side of said partition member, and Da設the first concrete member in contact with said adhesive layer,
On the other side of the partition member, characterized in that the Da設the second concrete member in contact with the adhesive layer.

The invention according to claim 5
The method for forming a concrete structure according to claim 4.
Reinforcing bar through holes are formed in the net body, and the net body is arranged along the joint surface or the striking surface in a state where the reinforcing bars are passed through the reinforcing bar through holes.
The cement-based adhesive is applied or sprayed on the front and back surfaces of the net body to form the adhesive layer .

The invention according to claim 6
The method for forming a concrete structure according to claim 4.
The second concrete material is placed within two weeks after the first concrete material is placed.
The invention according to claim 7
The method for forming a concrete structure according to claim 4.
Before forming the adhesive layer, and performing a degreasing treatment of the network element.

According to the present invention, it is possible to provide a partition material for concrete placing, which prevents the occurrence of slag leakage on the concrete joint surface and the parting surface and eliminates the need for post-cleaning treatment.

It is a schematic side view which shows the structure of one Embodiment of the installation of the partition material for concrete placing to which this invention is applied. It is a perspective view which shows the shape example of the partition material for concrete placing of FIG. It is a perspective view which shows the installation state of the partition material for concrete placing at the time of reinforced reinforcement. It shows an example of a state in which a partition material for concrete placement is installed in a formwork together with a reinforcing bar, and is a perspective view which showed an example of forming an adhesive layer on a net body. It is an enlarged view of the partition material installation part for concrete placing of FIG. It is a schematic perspective view which shows the degreasing treatment of a net body. It is a schematic perspective view which shows the primer processing of a net body.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 shows a schematic configuration of an embodiment of installation of a concrete placing partition material to which the present invention is applied, in which 1 is a concrete placing partition material and 2 is a formwork.

As shown in the figure, the concrete placing partition member 1 is formed in the formwork 2 by closing the mesh on the front and back surfaces of the net body 11 arranged along the concrete joint surface and the front and back surfaces of the net body 11. The adhesive layer 13 is provided.

FIG. 2 shows an example of the shape of the concrete placing partition material 1, and the concrete placing partition material 1 is a concrete frame formed around a net body 11 made of expanded metal (lath net) as shown in the drawing. The body 12 is integrally provided.
A required number of reinforcing bar through holes 11a are formed in the net body 11.

As shown in FIG. 3, the partition material 1 for concrete placement is assembled to the reinforcing bar 3 by passing the reinforcing bar 3 through the reinforcing bar through hole 11a as shown in FIG. 3, and then as shown in FIG. , Along with the ground-assembled reinforcing bar 3, for example, it is installed at a concrete joint position in the formwork 2 for beams.

In this way, as shown on both the front and back sides of the net body 11 of the concrete placing partition material 1 installed at the concrete joining position in the formwork 2, as shown in an enlarged view in FIG. 5, a fiber reinforced polymer dedicated to concrete joining is previously provided. Each of the cement-based adhesives is applied (or sprayed), and the mesh is crushed and hardened with the cement-based adhesive to form the cement-based adhesive layer 13.
Then, pre-cast concrete is placed in the formwork 2 (see FIG. 1).

With this partition material 1 for placing concrete, the cement-based adhesive layers 13 on both the front and back surfaces can secure and integrate with the pre-cast concrete, and the mesh of the mesh body 11 on the joint surface is almost completely closed. It is possible to prevent the occurrence of slag leakage, and it is possible to eliminate the need for post-cleaning processing.

Then, on another day (or on the same day), post-cast concrete is placed in the formwork 2 as shown in FIG.
Subsequent concrete can also be integrated by ensuring the adhesive strength with the pre-cast concrete by the cement-based adhesive layers 13 on both the front and back sides of the concrete placing partition material 1.

The cement-based adhesive layer 13 is effective up to a concrete joint interval of about 2 weeks.

As described above, according to the concrete placing partition material 1 of the embodiment, the net body 11 is provided with the net body 11 arranged along the joint surface and the concrete frame body 12 formed around the net body 11. After arranging the net body 11 along the joint surface with the reinforcing bar 3 passed through the reinforcing bar through hole 11a of 11, the fiber reinforced polymer cement-based adhesive is applied (or sprayed) to the front and back surfaces of the net body 11. ) To form the cement-based adhesive layer 13.
After that, by installing the concrete placing partition material 1 together with the reinforcing bar 3 in the formwork 2, it is possible to prevent the occurrence of slag leakage from the concrete joint surface and eliminate the need for the post-cleaning process.

(Modification example)
In the above embodiments, the partition material is used for the concrete joint of the beam, but the partition material of the present invention is not limited to this, and can be used for the concrete joint of any part.
Further, in the embodiment, the partition material is used for concrete casting, but the partition material of the present invention is not limited to this, and may be used for concrete casting to separate concrete having different strengths.
Further, in the embodiment, the partition material is assembled at the time of assembling the reinforcing bar at the site and then installed in the formwork, but after the reinforcing bar and the partition material are assembled in advance at the factory, they are transported to the site and installed in the formwork. , Reinforcing bars and dividers may be assembled in the formwork at the site.
In addition, the type of adhesive and the like are arbitrary, and it goes without saying that the specific detailed structure and the like can be changed as appropriate.

(Solvent degreasing of net body)
FIG. 6 shows an outline of the degreasing treatment of the net body 11, and the oil and fat adhering to the net body 11 is degreased before the adhesive is applied or sprayed on the front and back surfaces of the net body 11 to form the adhesive layer 13. To do.
That is, in the step before the adhesive is applied or sprayed on the front and back surfaces of the net 11 to form the adhesive layer 13, as shown in the figure, the net 11 placed in the tray 4 is used as a degreasing material 5, for example, a neutral detergent. The net body 11 is degreased by brushing the net body 11 with the brush 6. Then, the net body 11 is dried.

By degreasing the net body 11 in advance in this way, in the next step, cement-based adhesion by applying (or spraying) a fiber-reinforced polymer cement-based adhesive to the front and back surfaces of the net body 11 after the degreasing treatment. The adhesive strength of the agent layer 13 can be increased.

The degreasing material 5 may be an organic solvent such as acetone, gasoline, or the like, in addition to the neutral detergent.

(Primer treatment of net body)
FIG. 7 shows an outline of the primer treatment of the net body 11, and the net body 11 is primed before the adhesive is applied or sprayed on the front and back surfaces of the net body 11 to form the adhesive layer 13.
That is, in the step before applying or spraying an adhesive on the front and back surfaces of the net body 11 to form the adhesive layer 13, as shown in the figure, the net body 11 is used as a primer 8 with a brush 7 and has a low viscosity, for example, a low non-volatile content. By applying the liquid, the net body 11 is primed. Then, the primer 8 is dried.

In this way, by pre-priming the net body 11, in the next step, the cement-based adhesive by applying (or spraying) the fiber-reinforced polymer cement-based adhesive to the front and back surfaces of the net body 11 after the primer treatment. The adhesive strength of the layer 13 can be increased.

Instead of applying the primer 8, the primer 8 may be sprayed on the net body 11.

Further, after the degreasing treatment of the net body 11, the net body 11 may be further subjected to the primer treatment.

1 Partition material for concrete placement 11 Net body 11a Reinforcing bar through hole 12 Concrete frame body 13 Adhesive layer 2 Formwork 3 Reinforcing bar 4 Tray 5 Solvent degreasing material 6 Brush 7 Brush 8 Primer

Claims (7)

A concrete structure composed of a first concrete material to be cast first, a second concrete material to be cast later, and a partition material to be installed on a joint surface or a partition surface between the first and second concrete materials. hand,
The partition material is an adhesive composed of a mesh having a mesh arranged along the joint surface or the partitioning surface and a cement-based adhesive formed on the front and back surfaces of the mesh so as to close the mesh. A concrete structure characterized by having layers. The concrete structure according to claim 1, further comprising a concrete frame formed around the net body. The concrete structure according to claim 1 or 2, wherein a reinforcing bar through hole is formed in the net body. An adhesive layer made of a cement-based adhesive is formed on the front and back surfaces of the mesh body so as to close the mesh on a partition material having a mesh body arranged along the joint surface or the partitioning surface.
On one side of said partition member, and Da設the first concrete member in contact with said adhesive layer,
Wherein the other surface of the partition member, and characterized in that Da設the second concrete member in contact with the adhesive layer, the method of forming the concrete structure. The method for forming a concrete structure according to claim 4.
Reinforcing bar through holes are formed in the net body, and the net body is arranged along the joint surface or the striking surface in a state where the reinforcing bars are passed through the reinforcing bar through holes.
A method for forming a concrete structure, which comprises applying or spraying the cement-based adhesive on the front and back surfaces of the net body to form the adhesive layer. The method for forming a concrete structure according to claim 4.
A method for forming a concrete structure, wherein the second concrete material is placed within two weeks after the first concrete material is placed. The method for forming a concrete structure according to claim 4.
Wherein before forming the adhesive layer, the method of forming the concrete structure and performing degreasing treatment of the network element.

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